Random Crop Diseases

I Had this in PC Testing 2-4 weeks ago. But some other kid decided to make their own because they think they can live off others ideas. So I decided to release it
Random Crop Diseases is a mod where while you are playing it has a chance to randomly infect your crop with a diesease
Only happens Every day at midnight, fields have a small chance to get disease
Now to remove the diesease, all you got to do is spray your fields with Herbicide. 
Disease Progression
Stage 1 (Mild)
5% yield loss
Herbicide cures it completely
Stage 2 (Moderate)
15% yield loss
Herbicide cures it completely
Stage 3 (Severe)
30% yield loss
Herbicide only reduces it back to Stage 1